67 research outputs found
Ocean Acidification Summary for Policymakers:Third Symposium on the Ocean in a High-CO2 World
Atmospheric effects on extensive air showers observed with the Surface Detector of the Pierre Auger Observatory
Atmospheric parameters, such as pressure (P), temperature (T) and density,
affect the development of extensive air showers initiated by energetic cosmic
rays. We have studied the impact of atmospheric variations on extensive air
showers by means of the surface detector of the Pierre Auger Observatory. The
rate of events shows a ~10% seasonal modulation and ~2% diurnal one. We find
that the observed behaviour is explained by a model including the effects
associated with the variations of pressure and density. The former affects the
longitudinal development of air showers while the latter influences the Moliere
radius and hence the lateral distribution of the shower particles. The model is
validated with full simulations of extensive air showers using atmospheric
profiles measured at the site of the Pierre Auger Observatory.Comment: 24 pages, 9 figures, accepted for publication in Astroparticle
Physic
The Fluorescence Detector of the Pierre Auger Observatory
The Pierre Auger Observatory is a hybrid detector for ultra-high energy
cosmic rays. It combines a surface array to measure secondary particles at
ground level together with a fluorescence detector to measure the development
of air showers in the atmosphere above the array. The fluorescence detector
comprises 24 large telescopes specialized for measuring the nitrogen
fluorescence caused by charged particles of cosmic ray air showers. In this
paper we describe the components of the fluorescence detector including its
optical system, the design of the camera, the electronics, and the systems for
relative and absolute calibration. We also discuss the operation and the
monitoring of the detector. Finally, we evaluate the detector performance and
precision of shower reconstructions.Comment: 53 pages. Submitted to Nuclear Instruments and Methods in Physics
Research Section
AfecçÔes mais freqĂŒentes do aparelho locomotor dos eqĂŒĂdeos de tração no municĂpio de Belo Horizonte
Perfil hematolĂłgico de Ă©guas Quarto de Milha alimentadas com feno ou haylage de Tifton-85 ( Cynodon spp.)
Desempenho agronÎmico de seleçÔes de café Bourbon Vermelho e Bourbon Amarelo de diferentes origens
Levomepromazina e acepromazina no bloqueio da arritmia induzida pela adrenalina em cĂŁes anestesiados pelo halotano
Emprego da levomepromazina no bloqueio da arritmia induzida pela adrenalina em cĂŁes anestesiados pelo Sevoflurano
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